Machine for bending bars



(No Model.) 2 Sheets-Sheet 2.

' A. URBAHN.

MACHINE F011 BENDING BARS. No. 813,134. Patented Mar.- 3, 1885.

lisirrnn States Patent tries.

ALVVILL URBAHN, OF PATERSON, NEW JERSEY, ASSIGNOR TO JACOB MAY, OFBROOKLYN, NEXV YORK.

MACHINE FOR BENDlNG BARS.

SPECIFICATION forming part of Letters Patent No. 313,134., dated March3, 1885.-

Application filed June 10, 1884.

T aZZ 2117mm it may concern.-

Be it known that I, ALWILL URBAHN, a resident of Paterson, in the countyof Passaic and State of-New Jersey, have invented an Improved Machinefor Bending Metal, of which the following is a full, clear, and exactdescription, reference being made to the accompanying drawings, in whichFigure 1 is a perspective view of my imro proved machine for bendingmetal. Fig. 2 is a plan or top view of the same. Fig. 3 is a verticalcentral section of the same on the line 0 c, Fig. 2. Fig. at is a detailtop view of the clamping mechanism, showing the parts there- 1 ofseparated.

The object of this invention is to produce a machine on which rods orstraps of metal may be bent at one or two different places.

The invention consists in the novel combi- 2o nation of partshereinafter specified.

In the drawings. the letter A represents a suitable table or platform.Upon this table is secured by suitable bolts, a plate, B, of metal orother material, of circular or other form. Upon this plate Blies a bar,O,which, by a vertical swivel-pin, a, is swiveled to said plate B, as ismore clearly shown in Fig. 3. At the ends of the bar 0 areupwardlyprojecting lugs Z) and d. The bar O is straddled by the fork ofa lever, D, said fork being pivoted to the uprights b d of the said barby horizontal pivot-pins c. The ends of the fork of the lever D areprovided with upwardlyprojecting lugs f and g, which are in line withthe projections b (1, respectively, as shown, so that a bar or plate ofiron to be bent may be clamped between the lugs f b and g (1 wheneverthe'free end of the lever D is depressed; but when the free end of theleverD is raised,

40 as in Fig. 1, the said clamping-jawsfb and g (l are open. The freeend of the lever D carries a roller or enlargement, h, which bears upona spring, E, that is fastened upon the table A. WVhen the lever D is inthe position shown in Fig. 1, its free end is raised by a raised portionof the spring E, so as to hold the clamping-jaws open. The lever D canbe vibrated around the vertical swivel-pin a, together with the swivelcross-bar G, from about the position which is shown in Fig. 1, in thedirection of the arrow shown in that figure (No model.)

until it (the lever) strikes an abutment, i, which is fastened to theplate B, or may be fastened to the table A. This abutment should beremovable, so that it may be replaced by another, for the purpose ofvarying the sweep of the lever.

When the cross-bar and lever are in the position shown in Fig. 1, thesaid cross-bar is between two raised portions, j and Z, of the plate B,said raised portions being about on a level with the forked portion ofthe lever D, which is between them. To the projection j is secured, inline with the cross-bar C while the same is in the position shown inFig. 1, a further projection, m, which serves as a gage for locating oneend of the bar or strap of metal to be bent. To the projection j is alsofastened a roller, n, and to the projection Z is likewise fastened asimilar roller, 0, both said rollers turning on vertical axes.

The operation of the device is as follows: hen the machine is intheposition shown in Fig. 1, a plate or bar of iron to be bent is placedover the crossbar C, so that it fits between the jaws f b and r d. theend of said plate or bar which is to be bent bearing against theabutment m. The attendant now moves the lever D in the direction of thearrow which is shown in Fig. 1, at the same time bearing down upon saidlever, so that it will, while vibrating around the vertical axis (I,also vibrate around the horizontal axis 0 and reach the lowered portionof the spring E. The movement of the lever D around its horizontal pivotcauses the jaws f g to approach thej aws 0 (Z, and thereby to firmlyclamp the piece of metal which is between said jaws and prevent it fromsliding lengthwise. The lever D having thus clamped the piece of 0 metalwhich is tov be bent against the upright lugs of the crossbar 0, thefurther motion of said lever D around the vertical pivot a causes it tocarry said piece of metal against the rollers n and 0, thereby bendingits ends at sub- 5 stantially right angles in opposite directions, asclearly appears from Fig. 2, in which figure the letter F represents thestrap of metal, and the letters p and r the bent ends thereof. Theattendant next moves the lever D back to the position shown in Fig. 1,thereby opening the jaws and allowing the removal of the bent piece ofmetal and the reinsertion of another piece to be bent.

I have described the projecting portions j Z as being two separateprojections; but they may be united into a single projection, ifdesired.

The abutment m may be adjusted to different distances from the axis ofthe vertical pivot a, or may be removable to be replaced by anotherabuttingpiece differing from it in thickness.

Although I have shown the bending-blocks to be rollers a 0, and althoughsuch rollers, by causing less friction, are preferable to rigidbending-blocks, I desire it, nevertheless, to be understood thatbending-blocks supported rigidly on the plate B or table A in the placeof the rollers n 0 will be the equivalents for the purposes of myinvention of said rollers.

I claim- 1. The combination of the plate B, having projections j l andthe roller a, with the swiveled bar 0, having the lugs b d, and with thelever D, having the lugs f and 9, said lever being carried by thehorizontal pivot e, which joins it to the bar 0, substantially as hereinshown and described.

2. The combination of the plate 13, having projections j l and rollers42 0, with the swiveled cross-bar 0, having lugs b d, forked lever D,having lugs f g, and with the horizontal pivot e, which joins the leverD to the bar 0, substantially as herein shown and described.

3. The combination of the lever D, having lugs f g, with the pivot e,swiveled cross-bar G, bending-blocks a 0, and abutting-piece m,substantially as herein shown and described.

4. The combination of the spring E with the lever D, swiveled cross-barG, and one or more bending-blocks, n o, substantially as herein shownand described.

ALWILL URBAHN.

Vitnesses:

WILLY G. E. SCHULTZ, J OHN O. TUNBRIDGE.

